Pipe-coupling.



PATENTED JULY 24, 190e'.

`'r.s .P.minis.

PIPE ooUPLING; APRLIUAION FILED JAN. 27. 1905.

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UNITED STATES PATENT ornron.

JOHN S. F. MARKS, OF BALLARD, WASHINGTON, ASSIGNOR rIO NATIONAL WOODPIPE COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORA- TION OFCALIFORNIA.

PIPE-COIUPLING.

Specification of Letters Patent.

Patented July 24, 1906.

To all whom it may concern:

Be it known that I, JOHN S. F. MARKS, a citizen of the United States,residing at Ballard, in the county of King and State of Washin ton, haveinvented certain new and useful mprovements in Pipe-Couplings, of whichthe following is a specification, reference being had therein to theaccompanying drawings.

This invention relates to couplings .for wooden pipes; and its object isto provide a device of this character which is of inexpensiveconstruction, one which can be conveniently connected tothe adjacentends of the component lengths of a pipe-line, and is capable of reliablycoupling the same against any longitudinally-acting.strain likely to beencountered.

The invention consists in the novel construction of a coupling, as willbe hereinafter particularly described, and illustrated in theaccompanying drawings, wherein- Figure 1 is a longitudinal sectionalview of a pipe-coupling, showing an embodiment of my invention, and Fig.2 is a similar view ofv a modified form of the same.

In the drawings the reference-letter a indicates a metal sleeve havingat its ends external annular reinforcing-rings b to strengthen the sameagainst rupture. The inside of the sleeve is screw-threaded from itsopposite ends with reversely-inclined buttress-threads c-that is to say,threads having faces c perpendicular, or a proximately so, to the axisof the sleevew -le the other faces c are but slightly inclined from suchaxis, and the said faces are so disposed that the last-mentioned oneswill be toward the respective sleeve ends. The wooden pipes (indicatedby broken lines in Fig. l) are connected to the couplings by driving orforcing them into the sleeve-sockets under longitudinal pressure, andwhich by reason of the slanting faces of the securing-threads beingpresented is accom lished without cutting or materially wea {ening thewood fibers of the pipe. The resilience or elasticity of the wood,however, is suiiicient to expand the contracted or cramped fibers intothe interstices between 5o the said threads corresponding to a screwwhich is able to withstand any longitudinal forces tending to separatethe pipe lengths from the coupling members. Infact, I have repeatedlysubjected the pipes which have been held together by devices constructedin accordance with this invention, to a hydraulic pressure exceedingfour hundred and fifty pounds to the inch and without any apparentelongation to the pipe. The pipe lengths are disconnected from couplingsby turning, thereby withdrawing them by unscrewmg.

This invention is in no wise limited to a straight coupling, for it canobviously be used in a number of other useful applications, as couplingswith side outlets, as T s, Y s, crosses, &c., of which an example isshown in Fig. 2 and which I Awill now describe. In this T-coupling theinternally-screw-threaded parts are formed desirably in enlargedterminal hubs or bells e, which are disposed at such a distance apart asto provide therebetween room to make the side outlet f, which in likemanner is desirably formed with a terminal hub e. The internal diameterof the straight portion g intermediate the hubs,

as well as that of the part f to the inner end of the screw-threadedportion, is preferably made of the same diameters as that of therespective adjoining pipe ends. The advantages of such a constructionare apparent as enabling a more extended use of wood pipe.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

1. As a new article, a pipe-coupling consisting of a sleeve having aninternal screwthread with one vertical face and one inclined face, theinclined face extending from the point where it joins the vertical facetoward the center of the coupling from the end and toward thelongitudinal axis of the same.

2. As a new article of manufacture, a metallic pipe-coupling having aninternal screwthread with one surface of the screw-thread substantiallyat right angles to the longitudinal axis of the coupling, and the othersurface of the thread at an obtuse angle to the provided with aninternal drive screw-thread In testimony whereof I aIiX my signaturevsfith one1 vertical 1faee andone ilolimd face, in presence of tWoWitnesses.

o @Woo en pipe swing primari y a p am eX- Y ternal surface, said pipebeing driven into JOHN S' F MARKS 5 said Coupling so as to formscrew-threads on Witnesses:

Jshe pipe conforming to the screw-threads in PAUL BARNES,

the coupling. F. DUDLEY Moss.

